Aluminium alloy



Patented Feb. 22, 1938 UNITED. STATES ALUMINIUM ALLOY Yonosuke Matuenaga, Naka-kn, Yokohama, Japan No Drawing. Application May s, 1936, Serial No.

1 Claim.

This invention relates to an aluminium alloy consisting 2 to 5% magnesium, 6 to 14% zinc, 0.3 to 2% copper, 0.01 to 0.5% iron, 0.1 to 1.0% silicon, and the remainder aluminium, the con- 5 tent of silicon being always greater than that of iron. The alloy may also contain a trace to 1.0% manganese, a trace to 5% cobalt, a trace to 5% molybdenum, a trace to 1.5% lithium and also a small quantity of vanadium, beryllium and tungsten in place of a part of aluminium. The object of the invention is to obtain a new aluminium alloy which has both a great tensile strength and a great elongation especially when subjected under heat treatment.

15 An example of the alloy showing percentages of the elements employed and also tensile strength and elongation when the alloys are subjected under a mode of tempering and annealing is given as follows:

Mg 3.0 Zn 8.0 Cu 1.0 Fe 0.1 Si 0.3

Al -1. rest, Tensile strength lcg/cm Elongation percent 10 As will be seen from the above example, the new alloy gives a very great tensile strength and a very great elongation which are hardly obtainable in known aluminium alloys.

In Japan May 13, 1935 As to mutual actions of the elements for the new alloy, it is supposed as follows. A part of magnesium may combine with silicon to form magnesiumsilicide, and another part of magnesium may be alloyed with a part of zinc and 5 a part of aluminium to form various three elemental alloys of different percentage. Further copper may be alloyed with iron. These chemical compound and alloys may crystal out in the main element, viz., aluminium and may be 10 uniformly distributed therein. Further, when manganese is employed, this 'manganese and titanium not only act as reducing agents, but also hinders the growth of particles of zincmanganese-aluminium alloys and also of copl5" per-iron alloy so that the distribution of the alloys may be promoted.

Also it is deemed that the smaller percentage of iron gives a greater strength and elongation and this fact is supposed that iron may be detrimental to the natures, and this drawback is eliminated by using silicon or silicon and manganese in a greater percentage.

What I claim is: An aluminium alloy consisting of 2 to 5% magnesium, 6 to 14% zinc, 0.3 to 2% copper, 0.1 to 0.5% iron, 0.1 to 1.0% silicon and the remaindenaluminium, the content of silicon being al- .ways. greater than that of iron. 30

YONOSUKE MA'I'UENAGA. 

